Github user sunjincheng121 commented on the issue: https://github.com/apache/flink/pull/3585 Hi, @fhueske thanks a lot for your suggestions. And most of the comments make sense for me. I had updated the PR. There is one thing I'am not sure. About implementation of the `SourceFunction`. So please pay attention on it. Feel free to feedback me If it's incorrect. Thanks, SunJincheng
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